I'm being to think there is no real solution to the problem. As long as Tor serves its purpose of providing uncensored access to the Internet, bad guys will always abuse it, and the operators will almost always be at odds with their ISP. Anything we try to do to block abuse will destroy the very concept of Tor.
Ding ding ding. You're getting it now. :-)
Criminals using Tor is not a new problem. It's addressed as the first question in the Abuse FAQ, here:
https://www.torproject.org/docs/faq-abuse.html.en#WhatAboutCriminals
and it's discussed by the EFF here:
https://www.eff.org/deeplinks/2014/07/7-things-you-should-know-about-tor
There are a lot of smart people who have been talking about this for a long time. I won't list more sources but they are easy to find.